Knife holding block



FIG. 1 is a front, top, right side perspective view of a knife holding block showing my new design;

FIG. 2 is a front, top, left side perspective view thereof;

FIG. 3 is a rear, top, left side perspective view thereof; and

FIG. 4 is a bottom, front, left side perspective view thereof. 

The ornamental design for a knife holding block, as shown and described. 